সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
On which principle does the tape recorder function?
On which principle does the tape recorder function?
- ক. Boyleis law
- খ. electromagnetic induction
- গ. eletrovalency
- ঘ. All of these
সঠিক উত্তরঃ electromagnetic induction
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Basic Information of Daily Science, Inventions and...